Carbohydrate-Responsive Element-Binding Protein-Associated Metabolic Changes in Chemically Induced...

Area of Science:

• Metabolic regulation
• Hepatocarcinogenesis research
• Transcription factor function

Background:

• Carbohydrate-Responsive Element-Binding Protein (ChREBP) is a key regulator of carbohydrate and lipid metabolism.
• Understanding ChREBP's role in liver cancer is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the cell-type-specific functions of ChREBP and its isoforms (ChREBPα and ChREBPβ) in hepatocarcinogenesis.
• To elucidate the distinct roles of ChREBPα and ChREBPβ in liver tumor initiation and progression.

Main Methods:

• Utilized a diethylnitrosamine (DEN)-induced mouse model for hepatocarcinogenesis.
• Employed systemic ChREBP-knockout (KO) and hepatocyte-specific ChREBP-KO (L-KO) mice.
• Analyzed tumors using histology, morphometry, proliferation assays, immunohistochemistry, Western blot, and qPCR.

Main Results:

• Hepatocyte-specific ChREBPα loss (L-KO) significantly reduced tumor progression and hepatocyte proliferation.
• Systemic ChREBP knockout (KO) decreased tumor initiation but had a minor effect on progression.
• KO tumors showed downregulated AKT/mTOR signaling, glycolysis, and lipogenesis compared to wildtype (WT) tumors.

Conclusions:

• ChREBPα has an oncogenic role in liver cancer, particularly when specifically lost in hepatocytes.
• ChREBPβ may possess tumor-suppressive functions, as indicated by systemic knockout results.
• Targeting ChREBPα could be a potential therapeutic strategy for hepatocarcinogenesis.